TMUS 10-Q Quarterly Report March 31, 2021

T-MOBILE US, INC.

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TABLE OF CONTENTS

Part I. Financial Information Item 1. Financial Statements Note 1 Summary Of Significant Accounting Policies Note 2 Business Combination Note 3 Receivables and Expected Credit Losses Note 4 Sales Of Certain Receivables Note 5 Goodwill, Spectrum License Transactions and Other Intangible Assets Note 6 Fair Value Measurements Note 7 Debt Note 8 Tower Obligations Note 9 Revenue From Contracts with Customers Note 10 Earnings Per Share Note 11 Commitments and Contingencies Note 12 Restructuring Costs Note 13 Additional Financial Information Item 2. Management S Discussion and Analysis Of Financial Condition and Results Of Operations Item 3. Quantitative and Qualitative Disclosures About Market Risk Item 4. Controls and Procedures Part II. Other Information Item 1. Legal Proceedings Item 1A. Risk Factors Item 2. Unregistered Sales Of Equity Securities and Use Of Proceeds Item 3. Defaults Upon Senior Securities Item 4. Mine Safety Disclosures Item 5. Other Information Item 6. Exhibits

Exhibits

4.1 Forty-Third Supplemental Indenture, dated as of January 14, 2021, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 2.250% Senior Note due 2026. 8-K 1/14/2021 4.2 4.2 Forty-Fourth Supplemental Indenture, dated as of January 14, 2021, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 2.625% Senior Note due 2029. 8-K 1/14/2021 4.3 4.3 Forty-Fifth Supplemental Indenture, dated as of January 14, 2021, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 2.875% Senior Note due 2031. 8-K 1/14/2021 4.4 4.4 Forty-Sixth Supplemental Indenture, dated as of March 23, 2021, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 2.625% Senior Note due 2026. 8-K 3/23/2021 4.2 4.5 Forty-Seventh Supplemental Indenture, dated as of March 23, 2021, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 3.375% Senior Note due 2029. 8-K 3/23/2021 4.3 4.6 Forty-Eighth Supplemental Indenture, dated as of March 23, 2021, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 3.500% Senior Note due 2031. 8-K 3/23/2021 4.4 10.1* Form of Restricted Stock Unit Award Agreement (Time-Vesting) for Executive Officers under the Sprint Corporation 2015 Amended and Restated Omnibus Incentive Plan. 10.2* Form of Restricted Stock Unit Award Agreement (Performance-Vesting) for Executive Officers under the Sprint Corporation 2015 Amended and Restated Omnibus Incentive Plan. 10.3* Form of Restricted Stock Unit Award Agreement (Performance-Vesting) (Cash Settled) for Executive Officers under the T-Mobile US, Inc. 2013 Omnibus Incentive Plan. 10.4* Annual Incentive Award Notice under the 2013 Omnibus Incentive Plan. 10.5 First Amended and Restated Receivables Sale and Conveyancing Agreement, dated as of March 2, 2021, by and among T-Mobile West LLC, T-Mobile Central LLC, T-Mobile Northeast LLC and T-Mobile South LLC, as sellers, and T-Mobile PCS Holdings LLC, as purchaser. 10.6 First Amended and Restated Receivables Sale and Contribution Agreement, dated as of March 2, 2021, by and between T-Mobile PCS Holdings LLC, as seller, and T-Mobile Airtime Funding LLC, as purchaser. 10.7 Fifth Amended and Restated Master Receivables Purchase Agreement, dated as of March 2, 2021, among T-Mobile Airtime Funding LLC, as transferor, T-Mobile PCS Holdings LLC, as servicer, T-Mobile US, Inc. and T-Mobile USA, Inc., as performance guarantors, Billing Gate One LLC, as outgoing purchaser, Landesbank Hessen-Thuringen Girozentrale, as outgoing bank purchasing agent, MUFG Bank (Europe) N.V., Germany Branch, as outgoing bank collections agent, The Toronto-Dominion Bank, as administrative agent, and certain financial institutions party thereto. 10.8 Performance Guaranty, dated as of March 2, 2021, by T-Mobile US, Inc. and T-Mobile USA, Inc. 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities and Affiliates Whose Securities Collateralize Securities of the Registrant 31.1 Certifications of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 31.2 Certifications of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 32.1** Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 32.2** Certification of Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

Customer name	Ticker
Amazon.com, Inc.	AMZN
Big Lots, Inc.	BIG

TMUS 10-Q Quarter ended March 31, 2021

Exhibits